Hot-blast furnace.



R. H. VUNDENBOSCH.

HOT BLAST FURNACE.

APPLICATION FILED DEC. 14, 1915.

Patented Dec. 19, 1916,

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Raymond :1, -niar anon RAYMOND H. VONDENBOSCH, OF HOLLY'WQOD, CALIFORNIA.-

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Specification of Letters Patent. Patqgntgdl {Egg}. 119 31933 Application filed December 14, 1915. Serial No. 66,685.

vented new and useful Improvements in Hot-Blast Furnaces, of which the following is a specification.

This invention relates to hot blast furnaces, and pertains especially to furnaces which may be installed in the walls or floors of rooms. t

It is an object of this invention to provide a self-contalned furnace and register in which part of the air is heated indirectly by the burning fuel, and part is heated directly.

It is another object of this invention to provide a furnace which makes use of direct heating, but which will furnish warm air free from gas fumes, odoror smoke, and especially carbon monoxid. I

I attain these objects by means of the embodiments of my invention illustrated in the accompanying drawing, in which Figure 1 is a'perspective view of a fioor' furnace with parts broken away to better illustrate the path of the air and gases. Fig.

2- is .a horizontal section taken on the lineof Fig.1. Fig. 3 is an elevation of a wall furnace with part of the register plate broken away. .Fig'. 4 is a vertical section asseen on the line 4--4 of Fig. 3. Fig. 5 is a fee fragmentary-horizontal section as seen on the line 5-5 of Fig. 4.

Referring more particularly to Figs. 1 and 2, 6-indicates a box-like metallic casing open at the upper end and provided with a register plate! which is. intended to be flush with the floor when the furnace is installed. The casing6 is provided with air inlets 8 which are disposed in such position that air will be drawn in from below the floor of the room. The casing 6 assists in making the structure fire-proof. Within the casing 6 isthe furnace proper which consists of an apron 9 secured at its upper end to the register plate 7. Outside the periphery of the apron 9 are register openings 10 so that air may pass from the room downwardly between the apron 9 and the housing 6. Mounted. within the apron 9 and spaced therefrom is an air housing or drum 11 closed at the upper end and secured to a cylindrical base 12. Cylindrical base 12 has an inclined bottom 13. Near the upper end of the drum 11 are air outlet ports 14. Ad-

and a valve at 26.

jacent the base 12 are air inlet ports 15. A rmg 16 is disposed in the base 12 between the inclined bottom 13 and the side walls of of the drum 18, thereby forming with the drum 18, the drum 11, and the rings 16 and 19 an annular air heating chamber. Openings are formed in the ring 19 and openings registering therewith in the ring 16. Tubes 20 connect the openings in rings 19 and 16 thereby providing ducts for the passage of burnt gases from the upper end of the tubes to the chamber in the base 12 and out through the pipe 17.

A-perforated plate 21 is secured across the bottom: of the base member 12 and a burner 22 is mounted therein. The burner'22 is in the form of a cylindrical pipe with openings on the inner side shaped to produce flat luminous flames. A feed pipe for the burner smdicated at 23, a pilot light tube for lightmg the burner at 24, a lighting tube at 25, As the latter are not features of my invention they are not de scribedin detail. A

Assuming that the burner 22 is lighted the flames are directed inwardly toward the center with their tips adjacent the center. Air for. burning purposes is supplied in abundance through the perforated plate 21, there being an oversupply of air so that no carbonflat form a very eiiicient and eflective heater is provided. I The burnt gases pass up through the center of the drum 18 to the upper portion of the drum 11 and downwardly through the tubes 20 to the chamber in the base 12, which is hereafter called a smoke box, and out through the pipe'17.

As the burnt gases move upwardly through the center of the drum 18 there is a tendency for the gas to enpand at the center; a compression having been caused by reason of the flames being directed toward each other.

This assists in crowding the air out through" openings 25. ,Some air is taken through openings 8 in casing 6, passes downwardly between the apron 9 and the casing and under the lower part of the apron, into the chamber formed between the apron 9 and drum 11. some passin through the openings 32 is secured. The latter plate is adapted to be installed flush with the wall of the room. Within the housing 31 and spaced therefrom is a housing 33 which is secured to the register. A chamber 34 is formed between housings 31 and 33. Openings are provided in the register so that air may circulate about the housing 33. The chamber 34 provides insulation and makes, the structure fire-proof. Within the housing 33 is a combustion chamber housing 35, forming an air heating chamber 36 between the housings 33 and 35, and a combustion chamber37 between the housing 35 and the re ister plate 32. A flue passes through cham er 34 and connects chamber 36 with the outside of the housing 31 as indicatedat 38.

A flue for burnt gases connects housing 35 and the outside air as indicated at 39. Heating ducts 40 pass through chamber 37,

connecting the room with the air heating chamber'36 and providing means, whereby the hot burnt gases may circulate about the ducts and thereby heat the air passing from the heated chamber into the room.

' A bafile plate 41 directs the burnt gases forwardly producing a more efficient circu-. lation of the hot gases. The housing 35 for the combustion chamber is open at the lower end and is provided with an off-set 42 within which is disposed a burner 43 provided with tips for producing flat flames. Immediately above burner 43 are openings 44 in the wall. of the housing 35... The operation of the wall furnace is as follows: Air for combustion and for circulation in the room passes upwardly through flue 38, some of it passing into the chamber 36 and through heating. ducts 40 into the room, thereby being heated indirectly. Part of the air passes from flue 38 to feed the burner 43, the surplus passing close to the base of the burner jets through openings 44 into the chamber 36 and through heating ducts 40. Some of the air which is heated directly and also,

heated indirectly instead of passing through heating ducts 40 will pass upwardly and above the housing 35 through the register into the room. The burnt gases passing upwardly are directed along the heating ducts by the bafiie plate 41 and pass outwardly through flue 3 9.

It will be obvious that I have provided a furnace in which there is little wastage of heat and which is hygienic, fireproof, and compact.

What- I claim is:

1. A heating device, comprising a hous ing formin' a combustion chamber having a relatively arge air inlet, a fuel burner mounted adjacent said air inlet, an air housing spaced from said combustion chamber housing and forming therewith an air heat ing chamber adapted to be connected to a room for indirect heating of air, means disposed adjacent the fuel burner placing the combustion chamber and air heating chamher in communication and providing for direct heating of air, and means for the exit of burnt gases communicating with said combustion chamber and closed from said air heating chamber.

2. A heating device, comprising a housin forming a combustion chamber having a re atively large air inlet, a fuel burner mounted in said combustion chamber adjacent said air inlet, an air housing spaced ,from said combustion chamber housing and forming therewith an air heating chamber adapted to be connected to a room for indirect heating of air, ports in the combustion chamber housin disposed adjacent the fuel burner and connecting the combustion chamber and air heating chamber andproviding for direct heating ofair, and means for the exit of burnt gases communicating with said combustion chamber and closed from said air heating chamber.

3. A heating device, comprising a housing forming a combustion chamber having a relatively large air inlet, a fuel burner mountedin said combustion chamber adjacent said air inlet, ports in said combustion p,

said combustion chamber, openings in the second housing for the admission and outlet of air to the air heating chamber for indirect heating of air, and a flue for the-exit of burnt gases communicating with said tubes.

4. A heating device, comprising a base provided with an annular, smoke box and a combustion chamber opening at the center, a burner in said combustion chamber, a cornbustion chamber housing mounted on said base and having air outlet openings adjacent the base, an air heating chamber housing mounted'on the base and spaced from saidcombustion chamber housing and provided with openings adjacent the base and the top, tubes disposed in the chamber formed between said combustion chamber housing and air heating chamber housing for the passage of burnt gases from the combustion chamber to the smoke box, and a flue for the exit of burnt gases communicating with said tubes.

5. A heating device, comprising a base provided With an annular smoke box and combustion chamber opening at the center, a burner in said combustion chamber, a cylindrical combustion chamber housing open at the upper and lower ends and mounted on said base and havin air outlet openings in the Walls thereof ad acent the base, a cylindrical air heating chamber housing mounted on the base and spaced therefrom and closed at the upper end provided with open- RAYMOND VONDENBOSCH. 

